<!--HomeView.vue父级页面:控制除登录页以外所有页面共有的头部与左侧菜单栏-->
<template>
  <div style="display: flex;">
    <!--左侧区域-->
    <div :style="{width:(isCollapse ? '64px':'208px')}">
      <!--左侧菜单栏-->
      <el-menu
          background-color="#3C82F5" style="width: 100%;height: 100%;min-height: 100vh;"
          text-color="#fff" active-text-color="#ff0" :collapse="isCollapse" :collapse-transition="false"
          unique-opened router @select="selectMenu">
        <!--左侧菜单栏中的顶部条-->
        <el-row :gutter="10" style="padding-top: 10px;">
          <el-col :span="2"></el-col>
          <el-col :span="7" style="padding-left: 7px;">
            <el-avatar src="/imgs/admin/logo.png" style="width: 35px;height: 35px;"></el-avatar>
          </el-col>
          <el-col :span="isCollapse?0:13">
            <router-link to="/" style="color: #fff; text-decoration: none;
            font-weight: bold;position: relative;top: 8px;left: 2px;">智慧车辆
            </router-link>
          </el-col>
        </el-row>
        <el-sub-menu index="1">
          <template #title>
            <el-icon style="font-size:21px;">
              <User/>
            </el-icon>
            <span>用户管理</span>
          </template>
          <el-menu-item index="/user">用户列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="2">
          <template #title>
            <el-icon style="font-size:21px;">
              <Van/>
            </el-icon>
            <span>车辆管理</span>
          </template>
          <el-menu-item index="/vehicle">基本信息</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="3">
          <template #title>
            <el-icon style="font-size:21px;">
              <Place/>
            </el-icon>
            <span>调度管理</span>
          </template>
          <el-menu-item index="/application">申请列表</el-menu-item>
          <el-menu-item index="/audit">调度审核</el-menu-item>
          <el-menu-item index="/distribute">车辆分配</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="4">
          <template #title>
            <el-icon style="font-size:21px;">
              <Location/>
            </el-icon>
            <span>电子围栏</span>
          </template>
          <el-menu-item index="/geofence">围栏管理</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="5">
          <template #title>
            <el-icon style="font-size:21px;">
              <MessageBox/>
            </el-icon>
            <span>数据字典</span>
          </template>
          <el-menu-item index="/dict">字典管理</el-menu-item>
        </el-sub-menu>
      </el-menu>
    </div>
    <!--右侧区域-->
    <div :style="{width:(isCollapse ? 'calc(100% - 64px)':'calc(100% - 208px)')}">
      <!--右侧顶部条菜单栏-->
      <el-header style="background-color:#fff;padding-top: 20px;height: 10vh;">
        <!--右侧顶部条 折叠图标+退出登录-->
        <el-row :gutter="10">
          <el-col :span="18">
            <el-icon style="font-size: 20px;position: relative;
         top: 3px;" @click="changeCollapse">
              <Expand/>
            </el-icon>
          </el-col>
          <!--用户名与退出登录-->
          <el-col :span="6" style="position: relative;">
            <el-dropdown trigger="click" style="position: absolute;right: 20px;">
         <span style="font-size: 19px;font-weight: bold;">
            {{ user.username }}<el-icon><arrow-down/></el-icon>
         </span>
              <template #dropdown>
                <el-dropdown-menu>
                  <el-dropdown-item @click="logout()">退出登录</el-dropdown-item>
                </el-dropdown-menu>
              </template>
            </el-dropdown>
          </el-col>
        </el-row>
        <!--面包屑导航-->
        <el-breadcrumb separator="/" style="position: relative;top: 20px;">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in breadCrumb">{{item}}</el-breadcrumb-item>
        </el-breadcrumb>
      </el-header>
        <!--右侧下半部分 是可变的主体区域-->
      <el-main style="padding: 0;min-height: 90vh;overflow-y: auto;">
        <router-view/>
      </el-main>
    </div>
  </div>
</template>

<script setup>

import {ref} from "vue";
//定义变量用来控制左侧菜单栏是否折叠.默认不折叠
const isCollapse = ref(false);
//定义方法修改折叠状态
const changeCollapse = () => {
  isCollapse.value = !isCollapse.value;
}

//获取登录的用户信息
const user=ref(getUser());
//退出登录功能
const logout=()=>{
  if (confirm('确定要退出吗?')){
    localStorage.removeItem('user');
    //退出时,面包屑也需要清空!
    localStorage.removeItem('breadCrumb');
    window.location.href='/login';
    user.value='';
  }
}
//准备数组维护面包屑数据
let map={
  '/user':['用户管理','用户列表'],
  '/vehicle':['车辆管理','基本信息'],
  '/application': ['调度管理','申请列表'],
  '/audit': ['调度管理','调度审核'],
  '/distribute':['调度管理','车辆分配'],
  '/geofence':['电子围栏','围栏管理'],
  '/dict':['数据字典','字典管理']
};
//定义变量维护当前面包屑的数据
const breadCrumb=ref(JSON.parse(localStorage.getItem('breadCrumb')) || ['用户管理','用户列表']);
//选择菜单项时触发
const selectMenu=(index)=>{
  //根据选择的菜单项index,取出map中对应index的值如['车辆管理','基本信息'],赋值给breadCrumb
  breadCrumb.value=map[index];
  //将值存入localStorage中,防止刷新页面数据丢失
  localStorage.setItem('breadCrumb',JSON.stringify(breadCrumb.value));
}
</script>